I'd like to know why a function executes fine when called from x but not when called from y
- by Roland
When called from archive(), readcont(char *filename) executes fine! Called from runoptions() though, it fails to list the files "archived"! why is this?
The program must run in terminal. Use -h as a parameter to view the usage.
This program is written to "archive" text files into ".rldzip" files.
readcont( char *x) should show the files archived in file (*x)
a) Successful call
Use the program to archive 3 text files:
rldzip.exe a.txt b.txt c.txt FILEXY -a
archive() will call readcont and it will work showing the files archived after the binary FILEXY will be created.
b) Unsuccessful call
After the file is created, use:
rldzip.exe FILEXY.rldzip -v
You can see that the function crashes!
I'd like to know why is this happening!
/*
Sa se scrie un program care:
a) arhiveaza fisiere
b) dezarhiveaza fisierele athivate
*/
#include<stdio.h>
#include<stdlib.h>
#include<conio.h>
#include<string.h>
struct content{
char *text;
char *flname;
}*arc;
FILE *f;
void readcont(char *x){
FILE *p;
if((p = fopen(x, "rb")) == NULL){
perror("Critical error: ");
exit(EXIT_FAILURE);
}
content aux;
int i;
fread(&i, sizeof(int), 1, p);
printf("\nFiles in %s \n\n", x);
while(i-- >1 && fread(&aux, sizeof(struct content), 1, p) != 0)
printf("%s \n", aux.flname);
fclose(p);
printf("\n\n");
}
void archive(int argc, char **argv){
int i;
char inttext[5000], textline[1000];
//Allocate dynamic memory for the content to be archived!
arc = (content*)malloc(argc * sizeof(content));
for(i=1; i< argc; i++)
{
if((f = fopen(argv[i], "r")) == NULL){
printf("%s: ", argv[i]);
perror("");
exit(EXIT_FAILURE);
}
while(!feof(f)){
fgets(textline, 5000, f);
strcat(inttext, textline);
}
arc[i-1].text = (char*)malloc(strlen(inttext) + 1);
strcpy(arc[i-1].text, inttext);
arc[i-1].flname = (char*)malloc(strlen(argv[i]) + 1);
strcpy(arc[i-1].flname, argv[i]);
fclose(f);
}
char *filen;
filen=(char*)malloc(strlen(argv[argc])+1+7);
strcpy(filen, argv[argc]);
strcat(filen, ".rldzip");
f = fopen(filen, "wb");
fwrite(&argc, sizeof(int), 1, f);
fwrite(arc, sizeof(content), argc, f);
fclose(f);
printf("Success! ");
for(i=1; i< argc; i++)
{
(i==argc-1)? printf("and %s ", argv[i]) : printf("%s ", argv[i]);
}
printf("compressed into %s", filen);
readcont(filen);
free(filen);
}
void help(char *v){
printf("\n\n----------------------RLDZIP----------------------\n\nUsage: \n\n Archive n files: \n\n%s $file[1] $file[2] ... $file[n] $output -a\n\nExample:\n%s a.txt b.txt c.txt output -a\n\n\n\nView files:\n\n %s $file.rldzip -v\n\nExample:\n %s fileE.rldzip -v\n\n", v, v, v, v);
}
void runoptions(int c, char **v){
int i;
if(c < 2){
printf("Arguments missing! Use -h for help");
}
else{
for(i=0; i<c; i++)
if(strcmp(v[i], "-h") == 0){
help(v[0]);
exit(2);
}
for(i=0; i<c; i++)
if(strcmp(v[i], "-v") == 0){
if(c != 3){
printf("Arguments misused! Use -h for help");
exit(2);
}
else
{
printf("-%s-", v[1]);
readcont(v[1]);
}
}
}
if(strcmp(v[c-1], "-a") == 0)
archive(c-2, v);
}
main(int argc, char **argv)
{
runoptions(argc, argv);
}
